Hey, I am really glad that someone still cares about this kind of mods. My favourite part of it is obviously the Stonecutters Tunnel because there you get to hear the spooky, scary unused organ music:-). I liked the paintings so much, they're perfectly fitting with the theme since they are edited versions of the default ones rather than completely different ones.
P.S. I have played through the mod itself and personally edited some things:
I noticed Burns' mansion window sky texture was left untouched from level 4 so I replaced it with a part of the l7 skybox;
I replaced the flame light in the Stonecutters tunnel with the blue one found in the original Rich Side Restoration by Kenny (bc I liked that so much)